diff -r 000000000000 -r 6474c204b198 addon-sdk/source/test/test-list.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addon-sdk/source/test/test-list.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,58 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+const { List, addListItem, removeListItem } = require('sdk/util/list');
+const { Class } = require('sdk/core/heritage');
+
+exports.testList = function(assert) {
+  let list = List();
+  addListItem(list, 1);
+
+  for (let key in list) {
+    assert.equal(key, 0, 'key is correct');
+    assert.equal(list[key], 1, 'value is correct');
+  }
+
+  let count = 0;
+  for each (let ele in list) {
+    assert.equal(ele, 1, 'ele is correct');
+    assert.equal(++count, 1, 'count is correct');
+  }
+
+  count = 0;
+  for (let ele of list) {
+    assert.equal(ele, 1, 'ele is correct');
+    assert.equal(++count, 1, 'count is correct');
+  }
+
+  removeListItem(list, 1);
+  assert.equal(list.length, 0, 'remove worked');
+};
+
+exports.testImplementsList = function(assert) {
+  let List2 = Class({
+    implements: [List],
+    initialize: function() {
+      List.prototype.initialize.apply(this, [0, 1, 2]);
+    }
+  });
+  let list2 = List2();
+  let count = 0;
+
+  for each (let ele in list2) {
+    assert.equal(ele, count++, 'ele is correct');
+  }
+
+  count = 0;
+  for (let ele of list2) {
+    assert.equal(ele, count++, 'ele is correct');
+  }
+
+  addListItem(list2, 3);
+  assert.equal(list2.length, 4, '3 was added');
+  assert.equal(list2[list2.length-1], 3, '3 was added');
+}
+
+require('sdk/test').run(exports);